binutils-gdb/gdb/mi/mi-cmd-break.c

/* MI Command Set - breakpoint and watchpoint commands.
   Copyright (C) 2000, 2001, 2002, 2007, 2008, 2009, 2010
   Free Software Foundation, Inc.
   Contributed by Cygnus Solutions (a Red Hat company).

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#include "defs.h"
#include "arch-utils.h"
#include "mi-cmds.h"
#include "ui-out.h"
#include "mi-out.h"
#include "breakpoint.h"
#include "gdb_string.h"
#include "mi-getopt.h"
#include "gdb.h"
#include "exceptions.h"
#include "observer.h"

enum
  {
    FROM_TTY = 0
  };

/* True if MI breakpoint observers have been registered.  */

static int mi_breakpoint_observers_installed;

/* Control whether breakpoint_notify may act.  */

static int mi_can_breakpoint_notify;

/* Output a single breakpoint, when allowed. */

static void
breakpoint_notify (int b)
{
  if (mi_can_breakpoint_notify)
    gdb_breakpoint_query (uiout, b, NULL);
}

enum bp_type
  {
    REG_BP,
    HW_BP,
    REGEXP_BP
  };

/* Implements the -break-insert command.
   See the MI manual for the list of possible options.  */

void
mi_cmd_break_insert (char *command, char **argv, int argc)
{
  char *address = NULL;
  enum bp_type type = REG_BP;
  int temp_p = 0;
  int thread = -1;
  int ignore_count = 0;
  char *condition = NULL;
  int pending = 0;
  int enabled = 1;

  struct gdb_exception e;
  struct gdb_events *old_hooks;
  enum opt
    {
      HARDWARE_OPT, TEMP_OPT /*, REGEXP_OPT */ , CONDITION_OPT,
      IGNORE_COUNT_OPT, THREAD_OPT, PENDING_OPT, DISABLE_OPT
    };
  static struct mi_opt opts[] =
  {
    {"h", HARDWARE_OPT, 0},
    {"t", TEMP_OPT, 0},
    {"c", CONDITION_OPT, 1},
    {"i", IGNORE_COUNT_OPT, 1},
    {"p", THREAD_OPT, 1},
    {"f", PENDING_OPT, 0},
    {"d", DISABLE_OPT, 0},
    { 0, 0, 0 }
  };

  /* Parse arguments. It could be -r or -h or -t, <location> or ``--''
     to denote the end of the option list. */
  int optind = 0;
  char *optarg;
  while (1)
    {
      int opt = mi_getopt ("mi_cmd_break_insert", argc, argv, opts, &optind, &optarg);
      if (opt < 0)
	break;
      switch ((enum opt) opt)
	{
	case TEMP_OPT:
	  temp_p = 1;
	  break;
	case HARDWARE_OPT:
	  type = HW_BP;
	  break;
#if 0
	case REGEXP_OPT:
	  type = REGEXP_BP;
	  break;
#endif
	case CONDITION_OPT:
	  condition = optarg;
	  break;
	case IGNORE_COUNT_OPT:
	  ignore_count = atol (optarg);
	  break;
	case THREAD_OPT:
	  thread = atol (optarg);
	  break;
	case PENDING_OPT:
	  pending = 1;
	  break;
	case DISABLE_OPT:
	  enabled = 0;
	}
    }

  if (optind >= argc)
    error (_("mi_cmd_break_insert: Missing <location>"));
  if (optind < argc - 1)
    error (_("mi_cmd_break_insert: Garbage following <location>"));
  address = argv[optind];

  /* Now we have what we need, let's insert the breakpoint! */
  if (! mi_breakpoint_observers_installed)
    {
      observer_attach_breakpoint_created (breakpoint_notify);
      observer_attach_breakpoint_modified (breakpoint_notify);
      observer_attach_breakpoint_deleted (breakpoint_notify);
      mi_breakpoint_observers_installed = 1;
    }

  mi_can_breakpoint_notify = 1;
  /* Make sure we restore hooks even if exception is thrown.  */
  TRY_CATCH (e, RETURN_MASK_ALL)
    {
      switch (type)
	{
	case REG_BP:
	  set_breakpoint (get_current_arch (), address, condition,
			  0 /*hardwareflag */ , temp_p,
			  thread, ignore_count,
			  pending, enabled);
	  break;
	case HW_BP:
	  set_breakpoint (get_current_arch (), address, condition,
			  1 /*hardwareflag */ , temp_p,
			  thread, ignore_count,
			  pending, enabled);
	  break;
#if 0
	case REGEXP_BP:
	  if (temp_p)
	    error (_("mi_cmd_break_insert: Unsupported tempoary regexp breakpoint"));
	  else
	    rbreak_command_wrapper (address, FROM_TTY);
	  break;
#endif
	default:
	  internal_error (__FILE__, __LINE__,
			  _("mi_cmd_break_insert: Bad switch."));
	}
    }
  mi_can_breakpoint_notify = 0;
  if (e.reason < 0)
    throw_exception (e);
}

enum wp_type
{
  REG_WP,
  READ_WP,
  ACCESS_WP
};

/* Insert a watchpoint. The type of watchpoint is specified by the
   first argument: 
   -break-watch <expr> --> insert a regular wp.  
   -break-watch -r <expr> --> insert a read watchpoint.
   -break-watch -a <expr> --> insert an access wp. */

void
mi_cmd_break_watch (char *command, char **argv, int argc)
{
  char *expr = NULL;
  enum wp_type type = REG_WP;
  enum opt
    {
      READ_OPT, ACCESS_OPT
    };
  static struct mi_opt opts[] =
  {
    {"r", READ_OPT, 0},
    {"a", ACCESS_OPT, 0},
    { 0, 0, 0 }
  };

  /* Parse arguments. */
  int optind = 0;
  char *optarg;
  while (1)
    {
      int opt = mi_getopt ("mi_cmd_break_watch", argc, argv, opts, &optind, &optarg);
      if (opt < 0)
	break;
      switch ((enum opt) opt)
	{
	case READ_OPT:
	  type = READ_WP;
	  break;
	case ACCESS_OPT:
	  type = ACCESS_WP;
	  break;
	}
    }
  if (optind >= argc)
    error (_("mi_cmd_break_watch: Missing <expression>"));
  if (optind < argc - 1)
    error (_("mi_cmd_break_watch: Garbage following <expression>"));
  expr = argv[optind];

  /* Now we have what we need, let's insert the watchpoint! */
  switch (type)
    {
    case REG_WP:
      watch_command_wrapper (expr, FROM_TTY);
      break;
    case READ_WP:
      rwatch_command_wrapper (expr, FROM_TTY);
      break;
    case ACCESS_WP:
      awatch_command_wrapper (expr, FROM_TTY);
      break;
    default:
      error (_("mi_cmd_break_watch: Unknown watchpoint type."));
    }
}

/* The mi_read_next_line consults these variable to return successive
   command lines.  While it would be clearer to use a closure pointer,
   it is not expected that any future code will use read_command_lines_1,
   therefore no point of overengineering.  */

static char **mi_command_line_array;
static int mi_command_line_array_cnt;
static int mi_command_line_array_ptr;

static char *
mi_read_next_line ()
{
  if (mi_command_line_array_ptr == mi_command_line_array_cnt)
    return NULL;
  else
    return mi_command_line_array[mi_command_line_array_ptr++];
}

void
mi_cmd_break_commands (char *command, char **argv, int argc)
{
  struct command_line *break_command;
  char *endptr;
  int bnum;
  struct breakpoint *b;

  if (argc < 1)
    error ("USAGE: %s <BKPT> [<COMMAND> [<COMMAND>...]]", command);

  bnum = strtol (argv[0], &endptr, 0);
  if (endptr == argv[0])
    error ("breakpoint number argument \"%s\" is not a number.",
	   argv[0]);
  else if (*endptr != '\0')
    error ("junk at the end of breakpoint number argument \"%s\".",
	   argv[0]);

  b = get_breakpoint (bnum);
  if (b == NULL)
    error ("breakpoint %d not found.", bnum);

  mi_command_line_array = argv;
  mi_command_line_array_ptr = 1;
  mi_command_line_array_cnt = argc;

  break_command = read_command_lines_1 (mi_read_next_line, 1);
  breakpoint_set_commands (b, break_command);
}